That'll work great if you're searching for the latest hamster-on-a-piano video. It might not work quite so well if you're searching for something with substance. Despite the hype, most people aren't especially good at uncovering original content.
A totaly agree, people don't usualy share much stufs on facebook?
Have you seens around a link to a Hadoop tutorial in your news feed yet?
I think that sharing that sort of thing will be in a more targeted way, via e.g. yourpane.com. I never share links that don't appeal to everyone on Twitter or Facebook, but I send things to specific friends all the time.